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Related Questions:

Does you f 150 have electronic throttle control ? An does it have Variable Cam Timing (VCT) - if it does have Variable Cam Timing (VCT) it doesn't have an EGR valve ! What type scan tool did you use to pull the code with ? My FORD factory service information does not show that code for A 2004 F - 150 5.4 L 3 valve engine !

One common problem is a vac leak or a sticking throttle plate.The computer controls idle speed by how much air is allowed into the intake. The idle control valve could be sticking even tho you have cleaned it, or have a faulty motor.

mcdevito75 here, Sounds like the idle speed motor, Ford is known for these idle speed motors going bad, in the later stages the car races like crazy. have your repair shop check this idle speed motor and change it.

Your ford has power assisted breaks this power is delivered from the motor, at the point when the accelerator is inactive. There for it sounds like your idle speed setting is too low, if you have a rev counter then it should be reading around 1000 revs at idle, if not the idle needs increasing. Hope this helps